Vibginius j



(No Model.)

V. J. MAYO.

SEWING MACHINE SHUTTLE.

Patented Deo. 1, 1885.

wiz/11.6.5585' W (dw.

UNITED STATES PATENT Orricn. f

VIRGINIUS J. MAYO, OF ERIE, PENNSYLVAIA, ASSIGNOR TO GEORGE H. NOBLE, OF SAME PLAGE.

SEWING-MACHINE SHUTTLE..

S PEIPICATION forming part of Letters Patent No. 331,314, dated December 1, 1885.

Application filed 'November 28, 1884. Serial No. 149,033. (No model.)

To aZZ whom it may concern:

.Be it known that I, VIRGINIUs J. MAYo, a` citizen of the United States, residing at Erie, in the county of Eric and State of Pennsylvania, have invented certain new and useful Improvements in Sewing-Machine Shuttles; and Ifdo hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the construction of sewing-machine shuttles, and has for its obj ects improvements on the means for inserting the thread and applying the tension.

My device is illustrated in the accompanying drawings, as follows:

Figure l is a perspective view of one of my improved shuttles with the thread in place ready for use. Fig. 2 is a similar view showing the tension bar or clamp unclasped and open. Fig. 3 is a perspective view from the rear of the shuttle, and shows the parts in the same position as in Fig. l. Fig. 4 is a similar view to that in Fig. 3 of an open-ended shuttle. Fig. 5 is a top or plan view of the shnttlebody seen in Fig. 4, the tension-bar being removed.

The letter-A marks the shuttle-body; B, the tension-bar; O, the bobbin; D, the thread a a' a, the thread-slot in the Shuttle-body. b is the forward attachment and pivot of the tensionbar. b' is the rave on the side of the tensionbar. bZ marks the space between the points 1 and 2 on the tension-bar, which is the bearingpoint of the tension-bar upon the thread. b3 is a raised or arched part of the bar B, which forms a free threadway. b4 is the cover of the end of the shuttle, and is part of or formed on the tension-bar. b5 is the clinch or fastening of the tension-bar on the open-ended Shuttle.

i The essential features of my invention are the same in the two different constructions shown. In the construction shown in thev first three figures the tension-bar is pivoted at one end at b, and at the other end it has an enlargement, bt, for closing the end of the Shuttle. In the other construction shown the tension-bar is fixed at b bya screw and at b5 by clinching over the end of the body. In this construction the'slot a a' is deflected from the points 3 to 4, so as to pass out at one side of the bar. A deflection of the bar would serve the same purpose as the defiected slot.

In the construction shown in first three figures the slot does not need to end at one side of the bar, and hence it is not deflected, but it could as well be so, if desired, without in any way affecting the operationof the shuttle.

It is not new to form the tension-bar with an end cover thereon and pivot the same, as shown, nor is it new to secure the tension-bar at each end and leave the shuttle open, and therefore these features form no part of my invention.

The thread-slot in the body of the shuttle consists of the slots a a' and a' c, which lie at an acute angle to each other and intersect at the point a', near the inner end of the bobbinchamber. In other words, the thread-slot eX- tends from the back end of the shuttle to near the inner end of the bobbin-chamber', and then defiects back at a sharp angle to the point ai.

To insert the thread, all that is required is to draw it along the slot a a' to the point and then back in the branch slot a' a* to the point az. This may be done when the tensionbar is in place over the slot or not, as the case may be. The tension-bar B is so formed that the space bz, from 1 to 2, presses upon the Shuttle-body sufficiently to give the proper tension to the thread which passes under it from the point (L2 to the point 2 on the tensionbar. Rearward from the point 2 the tensionbar is arched up, forming the raised part ba, under which the thread has free passage as the shuttle moves to and fro. It should be observed that the draft of the thread from the tension-space is direct, and not back over an edge or through an eye, as is common. This is a great advantage, as it greatly lessens the liability of breaking the thread, and is one of the essential features of my invention. It will be seen that this result is effected by the arrangement of the point or eye a, the bearing-spacezb2, and the free or arched space ba, in a line in the order named with the line of forward motion of vthe shuttle.

The operation of my device will. be suffi- IOO extends from the rear end of the shuttle-o body to the forward end of the bobbin-v` chamber, and then offsets back toward the rear end,and a tension-bar` covering said slot,

which presses upon the shuttle-'body back of the offset of said slot.

2. In a sewing-machine shuttle, the combination, substantially as herein set forth, of a shuttle-Shell having the thread-slot aa' (L2, land the tension-bar B, covering said slot and having its bearing b2 back of :the lend a'z of said slot.

3. In a sewing-rnachne shuttle, the .combination, substantiallylas herein set forth, of a shuttle-Shell having a thread-slot which extends from the rear end of the shuttle body to the for-e =part -of ;the bobbin-chamber, and then offsets back toward the rear end, and a tension-bar which has its bearingspace back of the end of said offset, 'and a raised part for givi'ng a free thread-space back of said bearing-space.

4. In a sewing-machine shuttle, the combimati-on, substantially as herein set 'forth, of a shuttle-Shell having the thread-slot a a' a, and the tension-bar B, covering said slot, and having the bearing-space b2 back of the end a2 of said slot and the `:raised space b3 back of said bearing-space.

5. In a sewing-Inachine shuttle, the combination, substantially as herein set forth, of the tenson-bar B, having bearing-spaee b2 and raised space b3, and both of its ends seoured to the shuttle-body, and a shuttle-Shell having a thread-slot, which begins at the rear end of the shuttle-body at one side of the tension-bar and passes under the tension-bar and forward to near' the inner end of the bobbin-ehamber, and 'then offsets backward and ends at the forward end of vthe 'bearing-space b of the tension-bar.

In `vtestirnony whereof I affix 'my signature in Witnesses.

JNo. K. HALLooK, GEO. H. NoBLE. 

